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IEEE Transactions on Communications

Issue 1 • Date January 1976

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Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Publication Year: 1976, Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1976, Page(s): 1
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    Freely Available from IEEE
  • New Convolutional Codes - Part II

    Publication Year: 1976, Page(s):19 - 33
    Cited by:  Papers (12)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (984 KB)

    Part II presents a unified code-generation algorithm which contains new codes with rates from 14/15 to 49/50. For use with this class of codes, some simplifications of the weighted maximum likelihood decoding are suggested. An approximated error probability expression is set forth for using these codes in communications satellite channels, The measured results are remarkably close to the error rat... View full abstract»

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  • Analysis of Digital Errors in Nonlinear PCM Systems

    Publication Year: 1976, Page(s):59 - 65
    Cited by:  Papers (45)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (609 KB)

    The effect of digital errors in linear pulse code modulation (PCM) systems has been considered by several authors for channels with independent errors. In this paper we present a general approach of analyzing digital errors in linear and nonlinear PCM systems with arbitrary channels. The examples given in this paper cover the different standard nonlinear PCM systems and independent channel errors.... View full abstract»

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  • Regulatory Aspects of Digital Communications (Radio Frequency Considerations)

    Publication Year: 1976, Page(s):118 - 130
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    This paper describes the domestic and international rules, regulations, reports, and recommendations that have an impact on the design and operation of digital systems. The emphasis is on the technical and the radio frequency (RF) aspects, but nontechnical and baseband matters are mentioned briefly. Organizations discussed include the International Telecommunications Union (ITU), the International... View full abstract»

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  • Comments on "Mop-up equalization of certain AM-PM distortion effects in FDM-FM transmission systems"

    Publication Year: 1976, Page(s):148 - 149
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    In the above paper (ibid., vol. COM-22, pp. 1146-1147, Aug. 1974), the author has reported on an extension of work that the commentor initiated in 1969 and carried to an advanced stage in 1970 with the aid of a small group of very capable engineering associates. (He claims to be the first to observe and photograph second-order sideband asymmetry in the Western Electric TH-l system, the first to pr... View full abstract»

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  • Author's reply [to 'Comments on "Mop-up equalization of certain AM-PM distortion effects in FDM-FM transmission systems" ']

    Publication Year: 1976, Page(s): 149
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The original author notes that the Commentor (E. Henley) deserves full credit for first noticing the relationship between certain TH-1 distortion problems and secondorder sideband asymmetry. It is not apparent, however, that his IF equalizer bears any clear relationship to the equalizer discussed in my letter. Almost any adjustable IF equalizer can be made to favorably affect the noise in a partic... View full abstract»

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  • Reply by J. Gammie

    Publication Year: 1976, Page(s): 150
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (123 KB)

    First Page of the Article
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  • Reply by E.J. Henley

    Publication Year: 1976, Page(s): 150
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (123 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1976, Page(s): 0
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    Freely Available from IEEE
  • Synthesis of Short-Range FM Radars with General Modulations

    Publication Year: 1976, Page(s):11 - 19
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    A closed-form relationship is developed relating the range response, FM modulation, and demodulation functions for short-range FM radars such that, given two of the functions, the third may be determined. Synthesis and analysis techniques using the relation apply to a class of FM radars including both single- and dual-channel (directionalDoppler) systems with either deterministic or stochastis mod... View full abstract»

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  • On Routing and "Delta Routing": A Taxonomy and Performance Comparison of Techniques for Packet-Switched Networks

    Publication Year: 1976, Page(s):43 - 59
    Cited by:  Papers (28)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1664 KB)

    An inherent capability of packet-switched networks is the speed at which they can be reconfigured; various dynamic or adaptive routing techniques have been conceived to exploit this capability. In this study, existing techniques are described and an "ultra-dynamic" technique, delta routing, is invented. Several promising techniques are then selected for comparison with one another and with a netwo... View full abstract»

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  • Phase-Lock Loop Characteristics in the Presence of Nonwhite Noise for Bandpass Types of Modulating Spectra

    Publication Year: 1976, Page(s):98 - 106
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    In this concise paper the phase-lock loop (PLL) steady state characteristics for bandpass types of modulating spectra are determined. The usual assumption that the intermediate frequency (IF) bandwidth is wide compared with PLL bandwidth is not made. The characteristics are determined from measurements on an experimental system and from theoretical calculations using a quasi-linear model (QLM) of ... View full abstract»

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  • On the Use of Polarity Coincidence Correlation Techniques for Differential Phase-Shift-Keyed Demodulation

    Publication Year: 1976, Page(s):146 - 148
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The use of polarity coincidence correlation techniques can allow efficient use of digital logic elements for binary differential phase-shift-key demodulation. For the case of sinusoidal signals in the presence of additive Gaussian noise it is shown that an ideal hard limiter at the input to the demodulator adds no degradation to the bit error rate performance. View full abstract»

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  • A Recursive Digital Filter Using DPCM

    Publication Year: 1976, Page(s):2 - 11
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A recursive digital filter using differential pulse-code modulation (DPCM) is proposed. The filter can realize any rational transfer function without the need for a new design. Results on roundoff error and limit cycle oscillations are presented. The implementation of these filters is also discussed. View full abstract»

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  • A Per-Channel A/D Converter Having 15-Segment µ-255 Companding

    Publication Year: 1976, Page(s):33 - 42
    Cited by:  Papers (31)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    This paper describes a companded analog-to-digital (A/D) converter for voiceband signals that is simple and potentially inexpensive. The converter uses only 18 coarsely spaced analog levels. Fine resolution is obtained by oscillating between these levels at an increased speed and averaging the result over a Nyquist interval. The companding used in the converter is effectively the same as that of &... View full abstract»

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  • Crosstalk Loss Requirements for PCM Transmission

    Publication Year: 1976, Page(s):88 - 97
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    We present in this paper a unified approach to the crosstalk interference problem arising in PCM transmission on paired cables. For bipolar signaling, and three types of commonly used channel shaping, viz., cosine, raised cosine, and Gaussian, we present the minimum average near-end crosstalk (NEXT) and far-end crosstalk (FEXT) loss requirements at any transmission rate as a function of repeater s... View full abstract»

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  • Optical Communications Between Underwater and Above Surface (Satellite) Terminals

    Publication Year: 1976, Page(s):66 - 81
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    A multiple scattering model is used and extended to characterize the channel between underwater and airborne (satellite) terminals at optical frequencies. The effects of the air/sea interface are also included with approximate solutions accurate for elevation angles above 45°. The results are presented in terms of a radiance function which is related to the transform of the spatial covariance... View full abstract»

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  • On Stochastic Phase-Lock Loop Solutions

    Publication Year: 1976, Page(s):138 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The solutions to stochastic first- and second-order phaselock loop differential equations are studied in the sense of the calculus of Itô and Stratonovich. The solutions are found to be both theoretically and experimentally invariant to the calculus used. From numerical experimentation it was also discovered that the covergence properties of Euler's integration method was superior to that of ... View full abstract»

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  • Calculated Channel Characteristics of a Braided Coaxial Cable in a Mine Tunnel

    Publication Year: 1976, Page(s):82 - 87
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    The braided coaxial cable is studied as a communication scheme in a mine tunnel. A simplified rectangular waveguide model is adopted for the tunnel, and the shield of the cable is assumed to behave as a single inductive transfer impedance. Specific results on the attenuation of the monofilar and bifilar (or coaxial) modes of propagation, taking into account the possible existence of a thin lossy f... View full abstract»

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  • Generation of Linear and Nonlinear Synchronous Data Signals by Digital Echo Modulation in a Time-Varying Transversal Filter

    Publication Year: 1976, Page(s):112 - 118
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    It is shown that under certain moderate conditions, a large class of passband data signals, including all two-dimensional signal sets and many multilevel frequency-shift keying (FSK) signals, can be constructed from a finite set of stored waveforms. A description is given of a transversal filter with time-varying tap weights which can generate this class of signals. The configuration is amenable t... View full abstract»

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  • A Class of Soft Decision Error Detectors for the Gaussian Channel

    Publication Year: 1976, Page(s):106 - 112
    Cited by:  Papers (7)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The main idea of this concise paper is to use symbol reliability information for improving the performance of error detectors. A class of soft decision error detectors (SDED's) is presented, where low weight error patterns are selectively corrected. The reliability numbers govern which error pattern to correct. Asymptotic performance and bounds are derived for the Gaussian channel. It is shown tha... View full abstract»

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  • Performance Comparison Between a Simplified and the Optimal Decoder for Minimizing Symbol Error Rate

    Publication Year: 1976, Page(s):134 - 138
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The probability of error of the optimal decoder, based on the criterion of minimizing bit-error rate, is calculated for a Markov source imbedded in additive Gaussian noise for several specific cases. The tradeoff between bit-error rate and complexity of a simplified decoder is presented for various signal-to-noise ratios and Markov dependency. View full abstract»

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  • Measurement of Bit Errors in Data Transmission Systems

    Publication Year: 1976, Page(s):144 - 146
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    This correspondence presents an improved technique for receive error detecting a pseudorandom digital sequence suitable for bit error performance testing of serial digital transmission systems. The method is applicable to separately located transmit and receive sites, is self-synchronizing, and can be economically constructed using logic elements and medium-scale integrated (MSI) devices from comm... View full abstract»

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  • Entropy Measurements for Three Adaptive Source Encoders

    Publication Year: 1976, Page(s):131 - 133
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The entropy of the output of three adaptive source encoders, AΔM, APCM, and ADPCM, is measured for speech inputs at low sampling rates. It is attempted to correlate the source encoder output entropies, normalized to the channel bit rate, with the results of informal listening tests. It was hypothesized that the channel bit rate utilization factor would predict subjective ranking of the source... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas